Attempt to move motors when VIN is not in range

[Milke]

@Phaedrux I have an oscilloscope but I do not have acces to hot air station to replace the MCU, some components like to resistors or caps no problem to replace.

[Milke]

@alankilian said in Attempt to move motors when VIN is not in range:

@Phaedrux Is Vin monitored through one of the POWER_FAIL_DETx inputs?
If so, he could measure the voltage at those components and see if it's strange. It's possible one of the two resistors in the divider are poorly soldered or cracked.

@alankilian , do you refer to components like resistors and capacitors connected to PWR_FAIL_DET2 R80 - 47K, R81 - 4K7 AND C79 - 10nF and PWR_FAIL_DET R15 - 47K, R16 - 4K7 AND C80 10nF?

Attached a figure showing these components in the electronic circuit. 

[alankilian]

That's exactly what I'm talking about.

Those two resistors form a resistor-divider that produces a signal that is 9.1% of the input signal. (0.091 multiply by)

So a 12-volt input will produce 1.09 volts on the output signal.

HERE'S a page that lets you simulate a voltage divider.

[Milke]

@alankilian, @Phaedrux and @dc42. I solved the problem, thanks for yor tips and support.

I discovered the electronic component that was damaged, it was a 47K resistor (R80) of the voltage divider (PWR_FAIL_DET2).

I replaced the resistor with another resistor and my machine returned to normal!

[alankilian]

OH! That's excellent news!

I'm glad I helped a little.

[Milke]

@alankilian